EP0332743A1 - Chain saw drive sprocket with wear mark indicators - Google Patents

Chain saw drive sprocket with wear mark indicators Download PDF

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Publication number
EP0332743A1
EP0332743A1 EP88118114A EP88118114A EP0332743A1 EP 0332743 A1 EP0332743 A1 EP 0332743A1 EP 88118114 A EP88118114 A EP 88118114A EP 88118114 A EP88118114 A EP 88118114A EP 0332743 A1 EP0332743 A1 EP 0332743A1
Authority
EP
European Patent Office
Prior art keywords
sprocket
saw
chain
disposed
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88118114A
Other languages
German (de)
French (fr)
Inventor
Gary Scott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oregon Tool Inc
Original Assignee
Blount Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Blount Inc filed Critical Blount Inc
Publication of EP0332743A1 publication Critical patent/EP0332743A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q23/00—Arrangements for compensating for irregularities or wear, e.g. of ways, of setting mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/30—Chain-wheels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/909—Cutter assemblage or cutter element therefor [e.g., chain saw chain]
    • Y10T83/925—Having noncutting depth gauge

Definitions

  • THIS INVENTION relates to sprockets for chain saws and more particularly, to a chain saw sprocket that incorporates wear mark indicators to alert the chain saw user to the appropriate time for sprocket replacement.
  • chain saw sprockets have included no clear means to determine the end of their useful service life. Accordingly, chain saw users have been unsure as to when to replace the chain saw sprocket for optimum service and performance of their machine.
  • a chain saw sprocket is typically driven by a clutch drum and includes saw chain driving teeth which engage the drive links of a saw chain, thereby to drive the latter around a guide bar.
  • Chain saw sprockets are generally of two types. One type is the spur or open sprocket type wherein a plurality of radially extending teeth are positioned to engage the driving tangs of the saw chain drive links. The other type is known as a rim sprocket. This generally comprises a pair of disc-shaped cylindrical elements or rings having a plurality of pockets formed therebetween which receive the depending drive tangs of the saw chain drive links. A plurality of wedge-shaped teeth are positioned between the rims.
  • the drive tang of a drive link is received in each of the pockets as the sprocket is rotated under power.
  • the undersides of the side links or side plates of the saw chain ride on the rims.
  • Rim sprockets give smoother chain operation and result in less wear and chain damage because the chain is supported on the circular rims.
  • the invention provides a chain saw sprocket having an axis of rotation, a saw chain contacting surface on the sprocket and disposed about the axis, and a plurality of saw chain driving teeth, each of the teeth having a tip, characterised in that: at least one groove is disposed in the saw chain contacting surface; the groove is parallel to the axis of the sprocket; the groove is of a preselected depth and is disposed a predetermined distance from the tip of a saw chain driving tooth; and the depth of the groove is selected to indicate that replacement of the sprocket is necessary when the saw chain contacting surface is worn such that said surface is at the depth of the groove therein.
  • a spur-type chain saw sprocket 10 shown mounted on a hub 12 of a typical clutch drum 14.
  • Sprocket 10 includes a plurality of saw chain driving teeth 16, each of which has a tip 18, a leading face 20 and a trailing face 22. Faces 20 and 22 are disposed on either side of tip 18.
  • a saw chain 24 is driven by sprocket 10.
  • Saw chain 24 includes a plurality of longitudinally spaced apart centre links 26 having sprocket-engaging root portions or drive tangs 28 which are engaged by sprocket 10. Links 26 are pivotally connected together by means of oppositely disposed side links or side plates 30, 32 and rivets 34 forming pivot pins for the various links.
  • Side plates 30 are simple connector plates and all are identical.
  • Side plates 32 are each formed with a hook-shaped tooth 33 on its upper end and each is provided with a depth gauge 36 ahead of the tooth.
  • Saw chain 24 is supported upon a guide bar 38.
  • Sprocket 10 has an axis of rotation 40.
  • a plurality of wear indicating grooves 42 are formed in the leading faces 20 of each tooth 16 of sprocket 10.
  • Each of the grooves 42 is parallel to axis 40.
  • Each groove 42 is of a preselected depth and each is disposed a predetermined distance 43 from the tip 18 of a tooth 16 such that when the surface of leading face 20 is worn to the point that such surface is at the depth of a groove 42, the user is alerted to the fact that sprocket replacement is necessary.
  • FIGS 3 and 4 illustrates the invention incorporated in a typical rim sprocket 50 shown mounted on a splined hub 52 of a clutch drum 54.
  • Sprocket 50 is typically a unitary structure comprising a pair of disc-­shaped cylindrical elements or rims 56 forming pockets 58 therebetween.
  • a plurality of wedge-shaped saw chain driving teeth 60 are positioned between the rims.
  • a saw chain 62 is driven by sprocket 50.
  • Saw chain 62 includes a plurality of longitudinally spaced apart centre links 64 each of which has a sprocket-engaging root portion or drive tang 66 which is received in a pocket 58 and which engages a tooth 60 as sprocket 50 is rotated under power.
  • Centre links 64 are pivotally connected together by means of oppositely disposed side links or side plates 68, 70 and rivets 72 which form pivot pins for the various links.
  • side plates 68 are simple connector plates and all are identical.
  • Side plates 70 are each formed with a hook-shaped tooth 74 on its upper end and each is provided with a depth gauge 76 ahead of the tooth.
  • saw chain 62 is supported upon a guide bar 78.
  • the undersides of side plates 68, 70 ride on the cylindrical surfaces 84 of rims 56.
  • Sprocket 50 has an axis of rotation 80.
  • a plurality of wear indicating grooves 82 are formed in the cylindrical surfaces 84.
  • Each of the grooves 82 is parallel to axis 80.
  • Each groove 82 is of a preselected depth and each is disposed a predetermined distance 86 from the centre of the tip 88 of a tooth 60.
  • the grooves 82 are preferably disposed in pairs, one of each pair leading each tooth 60 and the other of each pair trailing, each groove 82 of the pair being disposed at an equal distance, leading and trailing, from the centre of tip 88.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Gears, Cams (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

A saw chain sprocket (10) has wear indicating grooves (42) disposed in the saw chain contacting surface (22), each groove (42) being located at a predetermined distance (43) from the tip (18) of saw chain driving tooth (16) such that when the sprocket surface (22) is worn to the depth of one of the grooves (42), sprocket replacement is indicated as necessary.

Description

  • THIS INVENTION relates to sprockets for chain saws and more particularly, to a chain saw sprocket that incorporates wear mark indicators to alert the chain saw user to the appropriate time for sprocket replacement.
  • Heretofore, chain saw sprockets have included no clear means to determine the end of their useful service life. Accordingly, chain saw users have been unsure as to when to replace the chain saw sprocket for optimum service and performance of their machine.
  • A chain saw sprocket is typically driven by a clutch drum and includes saw chain driving teeth which engage the drive links of a saw chain, thereby to drive the latter around a guide bar. Chain saw sprockets are generally of two types. One type is the spur or open sprocket type wherein a plurality of radially extending teeth are positioned to engage the driving tangs of the saw chain drive links. The other type is known as a rim sprocket. This generally comprises a pair of disc-shaped cylindrical elements or rings having a plurality of pockets formed therebetween which receive the depending drive tangs of the saw chain drive links. A plurality of wedge-shaped teeth are positioned between the rims. The drive tang of a drive link is received in each of the pockets as the sprocket is rotated under power. The undersides of the side links or side plates of the saw chain ride on the rims. Rim sprockets give smoother chain operation and result in less wear and chain damage because the chain is supported on the circular rims.
  • As a saw chain rides on each of the types of sprockets, wear occurs to the sprocket. Heretofore, there has been no means to indicate to the chain saw user when the sprocket should be replaced.
  • It is thus the principal object of the present invention to provide a chain saw sprocket with wear mark indicators to let the chain saw user know when the sprocket should be replaced.
  • Accordingly, the invention provides a chain saw sprocket having an axis of rotation, a saw chain contacting surface on the sprocket and disposed about the axis, and a plurality of saw chain driving teeth, each of the teeth having a tip, characterised in that: at least one groove is disposed in the saw chain contacting surface; the groove is parallel to the axis of the sprocket; the groove is of a preselected depth and is disposed a predetermined distance from the tip of a saw chain driving tooth; and the depth of the groove is selected to indicate that replacement of the sprocket is necessary when the saw chain contacting surface is worn such that said surface is at the depth of the groove therein.
  • In order that the invention may be more readily understood, embodiments thereof will now be described, by way of example, with reference to the accompanying drawings, in which:
    • Figure 1 is a side elevational view of a spur-type of chain saw sprocket illustrated in driving engagement with a saw chain, the sprocket incorporating wear mark indicators in accordance with the present invention;
    • Figure 2 is a perspective view of the spur sprocket of Figure 1 illustrated in association with a typical chain saw clutch drum;
    • Figure 3 is a side elevational view of a rim-type of chain saw sprocket illustrated in driving engagement with a saw chain, the sprocket incorporating wear mark indicators in accordance with the present invention; and
    • Figure 4 is an exploded view of the rim-type sprocket of Figure 3 illustrated in association with the typical clutch drum and splined hub of a chain saw.
  • Referring to the drawings and particularly to Figures 1 and 2, the present invention is shown incorporated in a spur-type chain saw sprocket 10 shown mounted on a hub 12 of a typical clutch drum 14. Sprocket 10 includes a plurality of saw chain driving teeth 16, each of which has a tip 18, a leading face 20 and a trailing face 22. Faces 20 and 22 are disposed on either side of tip 18. A saw chain 24 is driven by sprocket 10. Saw chain 24 includes a plurality of longitudinally spaced apart centre links 26 having sprocket-engaging root portions or drive tangs 28 which are engaged by sprocket 10. Links 26 are pivotally connected together by means of oppositely disposed side links or side plates 30, 32 and rivets 34 forming pivot pins for the various links. Side plates 30 are simple connector plates and all are identical. Side plates 32 are each formed with a hook-shaped tooth 33 on its upper end and each is provided with a depth gauge 36 ahead of the tooth. Saw chain 24 is supported upon a guide bar 38.
  • Sprocket 10 has an axis of rotation 40. In accordance with the invention a plurality of wear indicating grooves 42 are formed in the leading faces 20 of each tooth 16 of sprocket 10. Each of the grooves 42 is parallel to axis 40. Each groove 42 is of a preselected depth and each is disposed a predetermined distance 43 from the tip 18 of a tooth 16 such that when the surface of leading face 20 is worn to the point that such surface is at the depth of a groove 42, the user is alerted to the fact that sprocket replacement is necessary. It has been found that, for a 3/8 inch (0.953cm) seven tooth spur sprocket, a groove 0.020 inch (0.051cm) in depth and positioned 0.090 inch (0.229cm) along leading face 20 from the tip 18 of a tooth 16 is adequate to alert the user to the fact that sprocket replacement is necessary. For spur sprockets typically used in chain saws, grooves varying in depth from about 0.015 inch (0.038cm) to 0.030 inch (0.076cm) are satisfactory.
  • Figures 3 and 4 illustrates the invention incorporated in a typical rim sprocket 50 shown mounted on a splined hub 52 of a clutch drum 54. Sprocket 50 is typically a unitary structure comprising a pair of disc-­shaped cylindrical elements or rims 56 forming pockets 58 therebetween. A plurality of wedge-shaped saw chain driving teeth 60 are positioned between the rims. A saw chain 62 is driven by sprocket 50. Saw chain 62 includes a plurality of longitudinally spaced apart centre links 64 each of which has a sprocket-engaging root portion or drive tang 66 which is received in a pocket 58 and which engages a tooth 60 as sprocket 50 is rotated under power. Centre links 64 are pivotally connected together by means of oppositely disposed side links or side plates 68, 70 and rivets 72 which form pivot pins for the various links. Again, side plates 68 are simple connector plates and all are identical. Side plates 70 are each formed with a hook-shaped tooth 74 on its upper end and each is provided with a depth gauge 76 ahead of the tooth. Again, saw chain 62 is supported upon a guide bar 78. As can be seen, the undersides of side plates 68, 70 ride on the cylindrical surfaces 84 of rims 56.
  • Sprocket 50 has an axis of rotation 80. In accordance with the invention a plurality of wear indicating grooves 82 are formed in the cylindrical surfaces 84. Each of the grooves 82 is parallel to axis 80. Each groove 82 is of a preselected depth and each is disposed a predetermined distance 86 from the centre of the tip 88 of a tooth 60. The grooves 82 are preferably disposed in pairs, one of each pair leading each tooth 60 and the other of each pair trailing, each groove 82 of the pair being disposed at an equal distance, leading and trailing, from the centre of tip 88. When the cylindrical surfaces 84 of rims 56 are worn to the point that such surfaces are at the depth of a groove 82, the user is alerted to the fact that replacement of sprocket 50 is necessary. It has been found that, for a 3/8 inch (0.953cm) seven tooth rim sprocket, a groove in surfaces 84 of 0.020 inch (0.051cm) in depth and positioned 0.150 inch (0.381cm) on either side of the centre of each tip 88 is adequate to alert the user to the fact that sprocket replacement is necessary. For rim sprockets typically used in chain saws, grooves varying in depth from about 0.015 inch (0.038cm) to 0.030 inch (0.076cm) are satisfactory.
  • The features disclosed in the foregoing description, in the following claims and/or in the accompanying drawings may, both separately and in any combination thereof, be material for realising the invention in diverse forms thereof.

Claims (6)

1. A chain saw sprocket (10, 50) having an axis of rotation (40, 80), a saw chain contacting surface (20, 84) on the sprocket and disposed about the axis, and a plurality of saw chain driving teeth (16, 60), each of the teeth having a tip (18, 88), characterised in that: at least one groove (42, 82) is disposed in the saw chain contacting surface (20, 84); the groove (42, 83) is parallel to the axis (40, 80) of the sprocket (10, 50); the groove (42, 82) is of a preselected depth and is disposed a predetermined distance from the tip (18, 88) of a saw chain driving tooth (16, 60); and the depth of the groove (42, 82) is selected to indicate that replacement of the sprocket (10, 50) is necessary when the saw chain contacting surface (20, 84) is worn such that said surface is at the depth of the groove (42, 82) therein.
2. A chain saw sprocket according to claim 1, wherein the sprocket is a rim sprocket (50) comprising a pair of cylindrical rims (56) having cylindrical surfaces (84) and the saw chain driving teeth (60) are disposed intermediate the rims (56), the saw chain contacting surface being disposed on the cylindrical surfaces (84) of the rims (56), the groove (82) being disposed in the saw chain contacting surfaces (84) of the rim (56).
3. A chain saw sprocket according to claim 1 or 2, wherein at least one pair of grooves (82) are provided in the saw chain contacting surface (84), the pair of grooves (82) being disposed in the saw chain contacting surface (84) on opposite sides of a saw chain driving tooth (60), each of the grooves in the pair being disposed in the surface (84) at an equal distance from the tip (88) of a tooth (60).
4. A chain saw sprocket according to claim 1, wherein the sprocket is a spur sprocket (10) and the saw chain contacting surface (20) is disposed on a tooth (16) thereof, the tooth (16) having a leading (20) and a trailing face (21) disposed on either side of the tip (18) thereof, the groove being disposed in the leading face (20) of the tooth (16).
5. A chain saw sprocket according to any preceding claim, wherein the depth of the groove (42, 82) in the saw chain contacting surface (20, 84) is between about 0.015 inch (0.038cm) and 0.030 inch (0.076cm).
6. A chain saw incorporating a sprocket according to any preceding claim.
EP88118114A 1988-03-14 1988-10-31 Chain saw drive sprocket with wear mark indicators Withdrawn EP0332743A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US167537 1988-03-14
US07/167,537 US4776826A (en) 1988-03-14 1988-03-14 Chain saw drive sprocket with wear mark indicators

Publications (1)

Publication Number Publication Date
EP0332743A1 true EP0332743A1 (en) 1989-09-20

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EP88118114A Withdrawn EP0332743A1 (en) 1988-03-14 1988-10-31 Chain saw drive sprocket with wear mark indicators

Country Status (6)

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US (1) US4776826A (en)
EP (1) EP0332743A1 (en)
JP (1) JPH01242201A (en)
AU (1) AU2440888A (en)
BR (1) BR8806127A (en)
CA (1) CA1302734C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4493497C2 (en) * 1993-06-02 2002-01-03 Lauri Kalervo Ketonen chain saw
WO2024242601A1 (en) 2023-05-23 2024-11-28 Husqvarna Ab Drive sprocket

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5348515A (en) * 1993-01-13 1994-09-20 Case Corporation Sprocket wear indicator
US6560879B2 (en) * 2001-08-02 2003-05-13 Wci Outdoor Products, Inc. Chain saw adjuster
US7044025B2 (en) * 2004-09-27 2006-05-16 Blount, Inc. Rim sprocket for chain saw
DE102012009997A1 (en) * 2012-05-22 2013-11-28 Andreas Stihl Ag & Co. Kg "Motor chain saw with a feed pump"
DE102012010977B4 (en) * 2012-05-31 2024-11-28 Andreas Stihl Ag & Co. Kg Hand-held tool with a cutting chain for cutting mineral or metallic materials
DE102012211101A1 (en) * 2012-06-28 2014-01-02 Robert Bosch Gmbh driving element
US10703441B2 (en) * 2015-07-03 2020-07-07 Sram Deutschland Gmbh Drive arrangement for a bicycle
US10640299B1 (en) 2019-04-17 2020-05-05 Flexicon Corporation Wear indicator for sprocket tip
US11053639B2 (en) 2019-06-07 2021-07-06 Valmet Technologies Oy Refining member and hub with splines with a wear indicator
CN117167439B (en) * 2023-11-02 2024-01-16 博鼎精工智能科技(山东)有限公司 Energy storage electromagnetic auxiliary braking device

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949670A (en) * 1932-11-02 1934-03-06 American Brake Shoe & Foundry Brake shoe
US3059491A (en) * 1958-08-11 1962-10-23 Hoffco Inc Saw chain drive sprocket
US3087350A (en) * 1961-07-31 1963-04-30 Troy J Reed Sprocket for saw chain
US3099924A (en) * 1961-10-18 1963-08-06 Marine Associates Inc Sprocket for chain saws
US3135127A (en) * 1962-08-06 1964-06-02 Troy J Reed Sprocket for saw chain
US3410147A (en) * 1967-06-12 1968-11-12 Windsor Machine Company Ltd Chain saw sprocket drive assembly
US3491806A (en) * 1965-12-03 1970-01-27 Stihl Maschf Andreas Sprocket wheel,especially for motor chain saws
US3587516A (en) * 1970-02-09 1971-06-28 Lincoln Ag Products Inc Plate wear indicator
SU602716A1 (en) * 1975-09-25 1978-04-15 Московский станкоинструментальный институт Worm gear with hydrostatic lubrication
DE2908707A1 (en) * 1979-03-06 1980-09-11 Messerschmitt Boelkow Blohm Aircraft control mechanism drive shaft - has toothing notches in periphery only at points where bending stresses are small
DE3002138A1 (en) * 1980-01-22 1981-07-23 Fa. Andreas Stihl, 7050 Waiblingen SAW CHAIN FOR CHAIN SAWS, IN PARTICULAR MOTOR CHAIN SAWS
WO1983003379A1 (en) * 1982-03-30 1983-10-13 Beerens, Cornelis, Johannes, Maria Chain saws and chains therefor
EP0250113A2 (en) * 1986-06-18 1987-12-23 General Tire Inc. Tire with tread wear indicating grooves

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1949670A (en) * 1932-11-02 1934-03-06 American Brake Shoe & Foundry Brake shoe
US3059491A (en) * 1958-08-11 1962-10-23 Hoffco Inc Saw chain drive sprocket
US3087350A (en) * 1961-07-31 1963-04-30 Troy J Reed Sprocket for saw chain
US3099924A (en) * 1961-10-18 1963-08-06 Marine Associates Inc Sprocket for chain saws
US3135127A (en) * 1962-08-06 1964-06-02 Troy J Reed Sprocket for saw chain
US3491806A (en) * 1965-12-03 1970-01-27 Stihl Maschf Andreas Sprocket wheel,especially for motor chain saws
US3410147A (en) * 1967-06-12 1968-11-12 Windsor Machine Company Ltd Chain saw sprocket drive assembly
US3587516A (en) * 1970-02-09 1971-06-28 Lincoln Ag Products Inc Plate wear indicator
SU602716A1 (en) * 1975-09-25 1978-04-15 Московский станкоинструментальный институт Worm gear with hydrostatic lubrication
DE2908707A1 (en) * 1979-03-06 1980-09-11 Messerschmitt Boelkow Blohm Aircraft control mechanism drive shaft - has toothing notches in periphery only at points where bending stresses are small
DE3002138A1 (en) * 1980-01-22 1981-07-23 Fa. Andreas Stihl, 7050 Waiblingen SAW CHAIN FOR CHAIN SAWS, IN PARTICULAR MOTOR CHAIN SAWS
WO1983003379A1 (en) * 1982-03-30 1983-10-13 Beerens, Cornelis, Johannes, Maria Chain saws and chains therefor
EP0250113A2 (en) * 1986-06-18 1987-12-23 General Tire Inc. Tire with tread wear indicating grooves

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 37 (M-58)[709], 10th March 1981; & JP-A-55 160 694 (YAMAHA HATSUDOKI K.K.) 13-12-1980 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4493497C2 (en) * 1993-06-02 2002-01-03 Lauri Kalervo Ketonen chain saw
WO2024242601A1 (en) 2023-05-23 2024-11-28 Husqvarna Ab Drive sprocket

Also Published As

Publication number Publication date
US4776826A (en) 1988-10-11
AU2440888A (en) 1989-09-14
CA1302734C (en) 1992-06-09
JPH01242201A (en) 1989-09-27
BR8806127A (en) 1990-06-26

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